Structural hollow sections


Structural hollow with circular cross section are a significant part of all types of steel constructions in the industry and in the construction business. Structural hollow sections that are of a common diameter are produced using the hot rolling process.

Tubes of small diameters and tubes used in the construction business having thick wall are produced using the cold drawing process with a subsequent heat treatment.

Structural hollow sections

Structural hollow sections sizes

OUTER DIAMETER (OD)10,2 – 139,7 mm
WALL THICKNESS (WT)0,5 – 16,0 mm
EUROPEAN STANDARDSEN 10210-2,
DIN 2448,
NFA 49-501,
STN/ČSN 42 5715,
STN/ČSN 42 5716
RUSSIAN STANDARDSGOST 8732
Dimensional standard SIZES (OD x WT) Dimensional table
EN10210-210.2 x 0.5 – 139.7 x 16.0 mm
DIN244810.2 x 0.5 – 139.7 x 16.0 mm
STN42 571510.2 x 0.5 – 139.7 x 16.0 mm
ČSN42 571610.2 x 0.5 – 139.7 x 16.0 mm
NF A49-50110.2 x 0.5 – 139.7 x 16.0 mm
GOST873220.0 x 2.5 – 140.0 x 16.0 mm

Steel for structural hollow sections

EN 10210-1
S235JRH, S275JOH, S355JOH, S275J2H, S355J2H, S275NH,
S275NLH, S355NH, S355NLH, S420NLH, S460NH, S460NLH.
GOST 8731
09G2S, 10, 20, 35, 45.

Standard TDC Steel grade (open product)
GOST8731 / 19281
GOST8731 / 1050
GOST8731 / 1050
GOST8731 / 1050
GOST8731 / 1050
ČSN42 0250
STN42 0250
STN42 0250
STN42 0250
ČSN42 0250
ČSN42 0250
STN42 0250
ČSN42 0250
ČSN42 0250
STN42 0250
EN10210-1
EN10210-1
NF A49-501
DIN17121
DIN17124
DIN17124
DIN17124
DIN17124
EN10210-1
EN10210-1
EN10210-1
NF A49-501
EN10210-1
DIN17124
DIN17124
EN10210-1
STN42 0250
DIN17121
ČSN42 0250
EN10210-1
DIN17124
DIN17124
EN10210-1
DIN17121
DIN17124
NF A49-501
EN10210-1
NF A49-501
DIN17121
STN42 0250
EN10210-1
ČSN42 0250
STN42 0250
DIN17124
EN10210-1
ČSN42 0250
DIN17124
DIN17124
DIN17124
DIN17124
DIN17121
EN10210-1
STN42 0250
ČSN42 0250
DIN17124


Length of the structural hollow sections


Length [m]for sizes [mm]
5 – 6D < 60,3
5 – 6 or 10 – 14
(upon agreement 22,4)
D => 60,3 and t < 7,1
5 – 6D => 60,3 and t => 7,1
Types of supplied length of tubes are:
(a) random length,
(b) fixed length ± 500 mm,
(c) exact length – 0 + 15 mm.

Structural hollow section testing

Option (steels JRH, JOH):non-specific,
specific.
Specific (steels J2H, NH,NLH) test (obligatory) only:cast analysis,
test analysis,
impact test,
tube surface (visual examination),
dimensions,
NDT of weld.

Structural hollow sections surface protection

While ordering, it is necessary to agree upon the method and means of temporarily protecting the surface of the tubes during transportation and storiage.

Structural hollow section ends

The tubes with deburred ends or ends customized for welding.
The tubes with deburred ends or ends customized for welding.
The ends are vertical to the longitudinal axis and are without burrs.
The ends are vertical to the longitudinal axis and are without burrs.

Deburring applies to:

Deburring
  • Tube OD: 26,7 – 114,3 mm
  • Tube WT: 3,2 – 12,5 mm
  • Tube lengths: 4 – 13 m
  • Deburring angle, α (alpha): 30°+5°, 37,5°±2,5°
  • Dimension, c: 1,6 ± 0,8 mm

Packaging of the structural hollow sections


(a) tubes bound with a steel band,
(b) tubes wrapped in plastic sheets, burlap,
(c) tubes in wooden crates.

Structural hollow sections are supplied in packages with a circular or hexagonal outline with a weight of 300 to 3 500 kg

Packaking-STANDARD-tubes bound with a steel band
Packaking-STANDARD-tubes bound with a steel band
Packaking-STANDARD-bundle tied down by steel strap underlaid by paper
Packaking-STANDARD-bundle tied down by steel strap underlaid by paper
Packaking-STANDARD-PLUS-paper tape and polyethylene foil
Packaking-STANDARD-PLUS-paper tape and polyethylene foil
Packaking-STANDARD-PLUS-the bundle placed into a wooden box
Packaking-STANDARD-PLUS-the bundle placed into a wooden box
Packaking-PREMIUM-B-into a wooden box in which the tubes are wrapped in foil
Packaking-PREMIUM-B-into a wooden box in which the tubes are wrapped in foil
Packaking-PREMIUM-C-the bandles are wraped into and plastic foil
Packaking-PREMIUM-C-the bandles are wraped into and plastic foil
Packaking-PREMIUM-D-placing the whole shipment into foil+vacuum sealed
Packaking-PREMIUM-D-placing the whole shipment into foil+vacuum sealed

Marking of structural hollow sections and tube bundles

(a) without marking,
(b) marked with colored stripes on the tubes (tube bundles),
(c) marked with spray either by a white or black color using InkJet,
(d) marked by stamping the data (this applies to OD > 22 mm and WT >2.3 mm).

Bundles of tubes are marked with one or more labels with the required data.

Marked by a label
Marked by a label
Marked with spray either by a white or black color using InkJet
Marked with spray either by a white or black color using InkJet
Marked by stamping the data
Marked by stamping the data

EN 102042.2 nonspecified testing (only mandatory tests),
3.1 specific testing,
3.2 after agreement.
STN 42 0250,
ČSN 42 0250, DIN 50049
2.2 or 3.1.B, C.


Allowed straightness is 0.002 multiple of the tube length, for 1 meter length the allowed straightness is 3 millimeters.

The tubes are hot rolled above the transformation temperature and they are not heat treated.

The structure’s condition corresponds to normalized annealing.



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